She has now told E! Online that her character Amanda is a childhood friend of Ted (Michael Mosley).

"Their fathers are very good friends and [she] may or may not be romantically interested in him," Greene teased.

"But she definitely has a twist. I feel like all of the characters have a twist, and so it was a very interesting character that I haven't done yet."

Greene, who revealed that she is "excited" about the part, also compared Pan Am to a cable drama.

"I think Pan Am to me, when I look at it and when I watch it, seems like a mix of movie and TV," she said. "It's not quite a film, it's not quite TV. And it's a really interesting thing, kind of along the lines of what HBO does.

"I think it's just very beautifully and well shot. And it's in the 1960s, and I've been wanting to do something like that for a while."

Pan Am will return for a new episode in the US on December 4 on ABC. The show continues in the UK on Saturday at 10pm on BBC Two.